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Annotation of qemu/roms/seabios/src/pci_region.c, revision 1.1.1.1

1.1       root        1: // helper functions to manage pci io/memory/prefetch memory region
                      2: //
                      3: // Copyright (C) 2009 Isaku Yamahata <yamahata at valinux co jp>
                      4: //
                      5: // This file may be distributed under the terms of the GNU LGPLv3 license.
                      6: //
                      7: //
                      8: 
                      9: #include "util.h"
                     10: 
                     11: #define PCI_REGION_DISABLED     (-1)
                     12: 
                     13: void pci_region_init(struct pci_region *r, u32 first, u32 last)
                     14: {
                     15:     r->first = first;
                     16:     r->last = last;
                     17: 
                     18:     r->cur_first = r->first;
                     19: }
                     20: 
                     21: // PCI_REGION_DISABLED represents that the region is in special state.
                     22: // its value is chosen such that cur_first can't be PCI_REGION_DISABLED
                     23: // normally.
                     24: // NOTE: the area right below 4G is used for LAPIC, so such area can't
                     25: //       be used for PCI memory.
                     26: u32 pci_region_disable(struct pci_region *r)
                     27: {
                     28:     return r->cur_first = PCI_REGION_DISABLED;
                     29: }
                     30: 
                     31: static int pci_region_disabled(const struct pci_region *r)
                     32: {
                     33:     return r->cur_first == PCI_REGION_DISABLED;
                     34: }
                     35: 
                     36: static u32 pci_region_alloc_align(struct pci_region *r, u32 size, u32 align)
                     37: {
                     38:     if (pci_region_disabled(r)) {
                     39:         return 0;
                     40:     }
                     41: 
                     42:     u32 s = ALIGN(r->cur_first, align);
                     43:     if (s > r->last || s < r->cur_first) {
                     44:         return 0;
                     45:     }
                     46:     u32 e = s + size;
                     47:     if (e < s || e - 1 > r->last) {
                     48:         return 0;
                     49:     }
                     50:     r->cur_first = e;
                     51:     return s;
                     52: }
                     53: 
                     54: u32 pci_region_alloc(struct pci_region *r, u32 size)
                     55: {
                     56:     return pci_region_alloc_align(r, size, size);
                     57: }
                     58: 
                     59: u32 pci_region_align(struct pci_region *r, u32 align)
                     60: {
                     61:     return pci_region_alloc_align(r, 0, align);
                     62: }
                     63: 
                     64: void pci_region_revert(struct pci_region *r, u32 addr)
                     65: {
                     66:     r->cur_first = addr;
                     67: }
                     68: 
                     69: u32 pci_region_addr(const struct pci_region *r)
                     70: {
                     71:     return r->cur_first;
                     72: }
                     73: 
                     74: u32 pci_region_size(const struct pci_region *r)
                     75: {
                     76:     return r->last - r->first + 1;
                     77: }

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